Restart policy can be set

docker-py 0.5.0 required
it works only with docker > 1.2.0.
Merge pull request #78 from Teudimundo/restart-policy

Possibility to set restart policy from configuration file
Cleanups to restart policy code

Parameters for the restart policy are now 'name' and 'retries', and a
single, colon-separated string can also be used, like "on-failure:3".

Signed-off-by: Maxime Petazzoni <max@signalfuse.com>
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